Water heater



Oct. 8, 1929.

Filed June 27, 1925 C. A. PIERSON WATER HEATER 2 Sheets-Sheet l C Li 4.7 :wm/

INVEN T1:

Oct. .8, 1929. c. A. PERSON. 1,731,053

I IATBR HEATER Filed June 27, 1925 2 Sheets-Sheet 2 I 6 INVE'ILTTEI g AtrTmz mt-remu Oct. 8, 1929 UNITED STATES PATENT OFFICE warms. marina.

Application-fled June 27, 1985. Serial Io. 89,998.

This invention relates to liquid heaters.

.This invention hasutility when incorporated in electric heating units,especially of the sectional'type. 5 Referring to the drawings:

Fig. 1 is a view of an embodiment of fe'atures thereof in connectionwith a tank heater installation;

Fig. 2 is a detail view on an enlarged scale of the heater, with partsbroken away;

Fig. 3 is an end view of the heater Fig. 2, parts being broken away;

Fig. 4 is a detail view of the heating element, or shell for theelectrical unit; and

Fig. 5 is a detail view of the porcelain for carr ing the heat impartingelectrical wire.

ater service supply line 1 is a shown as entering domestic water tank 2.For heating, circulation line 3 from the lower portion of the tank 2extends to have threaded connection through boss 4 for supplying waterinto chamber 5, as a circulation chamber. This chamber 5 has internallythreaded lateral 25 openings 6'in a riser side remote from the openingat the boss 4. In the opposite side of the chamber 5 from the boss 4 isopening at internally threaded boss 7.

Therhamber 5 may in practice he of different sizes fora desired numberof openings 6. In such chamber 5, bafiles or circulati'on directingmeans 8, 9, may be alternately disposed for providing a sinuous paththrough the housing or main chamber 5 for rendering the heatingoperation more efjficient.

Discharge line from the chamber 5 at the boss 7 may extend to the upperportion of the tank 2. Hot water may be drawn off by way of line 11, tospigot 12. Sediment may be drawn on at spigot 13 in the line 3.

Where it is desired to connect up the heater for operation, switch 14 isclosed thereby connecting electric current from supply lines 15, 16, toterminals 17, 18, adjacent the openings 6 in the chamber 5.

In each opening 6 is inserted a metallic heat conductor shell 19 havingexternally threaded enlargement 20 for threaded coaction with theopenings 6 as in a row along one side of the chamber 5. Each shell 19terminates in a Pm], O1 TOLEDO, OHIO, ASSIGNOB TO THE STANDARD ELECTRIC00., OF TOLEDO, OHIO, A CORPORATION OF OHIO polygonal flange 21 havingrecess 22 about an opemng 23 in such end ofthe shell 19. Remote fromthis flange 21, this shell 19 has closed end 24. Rising fromthisclosed'end 24 is central stem 25, providing annular opening 26between the cylindrical portion of this shell 19 and the stem 25.

the shell 19 may protrude in such recess and act as a heat conductor forkeeping down the temperature in this porcelain 27, while the helicalportion 32 of the heat conductor is slightly spaced from the shell 19 toradiate 1 heat directly against such shell 19 so that n such shell asimmersed in the chamber 5 is an effective heat imparting device as thewater or other liquid is circulated through such chamher 5. Theporcelain 27 has overhang 35 for holding the loop end of the heatingwire helix 32. For holding the porcelain to keep it r spaced from thewall of the shell 19, there is enlargement 36 at its terminus remotefrom the flange 28.

. These heating shel s 19 may be readily assembled into a li uid tightunit which is not 8 exposed to loosening up in transit or installation.Furthermore, the assembly or replacement of the heating elements may behad independently ,of any disturbance of the water circulation portionor any of its joints. These are features material in contributing tominimize water leakage and electrical troubles therefrom as well assimplifying care and upkeep.-

In the automatic control herein disclosed, solenoid switch 37 may be cutout by the action of thermostat 38 shown as disposed in the lowerportion of the housing.

What is claimed and it is by Letters Patent is:

desired to cure 2 v mamas 1. An electric heatin element carrierembodying a terminally anged integral unit having a helical groovebetween said flanges, one of said flanges being larger than the 5 other,and a heat conducting mounting shell in which the smaller flange centersthe element and in which shell the larger flange is efiective to sustainthe element and from which larger flange the shell extends to envelopthe element, other flange and groove.

2. An electric heating element carrier embodying a terminally flangedinte ral unit having a helical groove between said flanges, one of saidflanges being larger than the other, and a heat conducting mountingshell having an cpen end provided with an enlargement about said openend forming a seat with which said larger flange coacts to close theshell open end and determine the longitudinal positioning of the elementand centering in the shell, said smaller flange coacting with the shellinterior in centering the other end of the element in the shell.

3. An immersion liquid heater; unit complete in itself comprising ametallic shell open at one end and provided with an enlargement forminga seat about said open end, and adjacent said open end about the shell athreaded region for mounting said shell in the wall of a container, aninsulation unit in said shell comprising a. member having terminalenlargements, one larger than the other, the larger coacting with saidseat for closing the open end and positionin the element longitudinallyof the shell, said smaller en largement coacting therewith for radiallypositioning the member as to the shell, there being a double pitched waybetween the enlargements, openings through said greater 4 enlargementcommunicating with the different pitches of the way, terminals disposedin said openings andcarried by said unit, and a helical electricresistance continuous throu h the way between the terminals. 7

4. in electrlc heater unit insulator provided with terminal enlargementsintegral therewith, one having a pair of opemn therethrough extendinglongitudinally of t e insulator, said insulator intermediate said 59enlargements having externally thereof an electric conductor helical waytherealong of double pitch with thediflerent pitches of which saidopenings directly communicate in the longitudinal extent of saidopenings and a pair of electric terminals disposed in said openings andcarried by said insulator unit.

' In witness whereof I aflix my signature.

CHARLES A. PIERSON.

